diff --git a/C++ Code/decToBinary.cpp b/C++ Code/decToBinary.cpp
new file mode 100644
index 0000000..2422fd3
--- /dev/null
+++ b/C++ Code/decToBinary.cpp	
@@ -0,0 +1,47 @@
+// convert decimal to binary
+
+#include <iostream>
+
+#include <cmath>
+
+using namespace std;
+
+long long convert(int);
+
+int main() {
+
+  int n, bin;
+
+  cout << "Enter a decimal number: ";
+
+  cin >> n;
+
+  bin = convert(n);
+
+  cout << n << " in decimal = " << bin << " in binary" << endl ;
+
+  return 0;
+
+}
+
+long long convert(int n) {
+
+  long long bin = 0;
+
+  int rem, i = 1;
+
+  while (n!=0) {
+
+    rem = n % 2;
+
+    n /= 2;
+
+    bin += rem * i;
+
+    i *= 10;
+
+  }
+
+  return bin;
+
+}